Battery light is on,engine running fine,started fine, but headlig
Battery light is on, engine running fine, started fine, but headlights are dim very dim and seem to get dimer....so i have come home and taken wifes car to work....but it fired up lovely each day since i bought it last weekend.
Any help i would be grateful....:) Dave.
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Re: Battery light is on,engine running fine,started fine,...
First i would go to a autoparts store and have them check my battery. most do it for free. it might just need to be charged or replaced. 2nd, it's possible the altenater is bad. they can check those also, but you have to take it out yourself. good luck
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while the voltage on the battery may be perfect with a multimeter on a still test , what is the battery voltage when trying to crank the engine. If the voltage drops to below 10 volts you have a battery problem. All headlights dim while cranking and the flatter the battery the greater the dim of the lights. It is bad practice to have the lights on while trying to crank the engine as the current draw for the lights takes power away from the ECM and ignition system
turn on the headlights and try to crank the engine; if the lights dim out while you try to crank, then the starter is ok but the battery is too weak. just turning on the lights does not mean that the battery has enough juice to crank the engine; a starter pulls a lot more than lights. If the headlights do not dim out and it still won't crank, then the starter or a connection to the starter is your problem.
Alternator. Have it tested with a voltmeter while on the car and running. Or take it off and have it tested. The current to run the car and the accessories is from the alternator when the engine is running. The battery light coming on alerts you that the alternator is not doing its job.
When you say "turn key dash lights go out and all is dead", do the lights come back on when you turn the key back to "off"?
With key off, try turning on your headlights- are they bright?
Flip to high beams-do they get brighter?
**If lights get dim while trying this, it's the battery-(dead/needs charged or replaced-which may have been caused by a bad alternator).
Leave lights on, now turn your ignition switch to "on"-do the lights get dim or go out?
Try and start the car-anything change?
If the lights were fine until you tried to start the car, more than likely your battery terminals need cleaning/tightening.
The lights should at least get dim when you try and start the car but only while the starter turns over: when the engine is running your lights (as well as all your other electrics) are powered by the alternator.
If you do all this and lights are okay all through this procedure, your problem is probably in your starter circuit. (Starter relay, ignition/key switch)
check your battery cables & connections ! also turn on your headlights & try to start your engine & have someone watch your headlights & see if your headlights dim you have bad battery or connections if they don't dim you could have a bad starter or bad connection @ starter !!